So it was never really lost. As far as we know it simply wasn't produced in 1 particular region (Europe) for a relatively short amount of time (1 century). And

So it was never really lost. As far as we know it simply wasn't produced in 1 particular region (Europe) for a relatively short amount of time (1 century). And, like I said before, it did not offer any significant structural advantages for its labor inefficiency. So "Damascus steel" is just 1 minor technique of producing a specific steel alloy, with many substitutes that had been used in its place. It's not like human civilization suddenly lost the technology of steel production and forging. Lost tech is a meme. I could say the modern humanity lost the tech of making horse armor, but it is just inaccurate semantics. We can still make metal and we can still make armor in the shape of a horse, we just don't, because there's no demand for it.